A. "mild" and "command" show that the Mother of Exiles is both gentle and powerful.
The word "mild" suggests a gentle and benevolent nature, while the word "command" suggests power and authority.
C. "huddled masses" (line 11) is whom the Mother of Exiles is addressing in these lines.
The Mother of Exiles is calling out to the "huddled masses" who are yearning to breathe free, and inviting them to come to her. She is saying that she will welcome them and give them a new home in America.